Reverse link traffic power control

ABSTRACT

Systems and methodologies are described that facilitate reverse link power control on a traffic channel. Indications of other sector interference or other such interference levels can be broadcasted in a wireless communication. Further, power control related information can be included in assignments to mobile devices. Mobile device can utilize the information in the assignment to set a range for delta-based power control. Further, devices employ broadcasted interference indications to maintain and adjust delta values that enable power settings to be established on traffic channels. Moreover, mobile devices may provide feedback to facilitate future assignments.

CLAIM OF PRIORITY UNDER 35 U.S.C. §120

The present Application for Patent is a Divisional and claims priorityto patent application Ser. No. 11/858,472, entitled “REVERSE LINKTRAFFIC POWER CONTROL” filed Sep. 20, 2007 and assigned to the assigneehereof and hereby expressly incorporated by reference herein.

BACKGROUND

I. Field

The following description relates generally to wireless communications,and more particularly to delta-based reverse link traffic power control.

II. Background

Wireless networking systems have become a prevalent means by which amajority of people worldwide has come to communicate. Wirelesscommunication devices have become smaller and more powerful in order tomeet consumer needs and to improve portability and convenience.Consumers have become dependent upon wireless communication devices suchas cellular telephones, personal digital assistants (PDAs) and the like,demanding reliable service, expanded areas of coverage and increasedfunctionality.

Generally, a wireless multiple-access communication system maysimultaneously support communication for multiple wireless terminals oruser devices. Each terminal communicates with one or more access pointsvia transmissions on the forward and reverse links. The forward link (ordownlink) refers to the communication link from the access points to theterminals, and the reverse link (or uplink) refers to the communicationlink from the terminals to the access points.

Wireless systems may be multiple-access systems capable of supportingcommunication with multiple users by sharing the available systemresources (e.g., bandwidth and transmit power). Examples of suchmultiple-access systems include code division multiple access (CDMA)systems, time division multiple access (TDMA) systems, frequencydivision multiple access (FDMA) systems, and orthogonal frequencydivision multiple access (OFDMA) systems.

Typically, each access point supports terminals located within aspecific coverage area referred to as a sector. A sector that supports aspecific terminal is referred to as the serving sector. Other sectors,not supporting the specific terminal, are referred to as non-servingsectors. Terminals within a sector can be allocated specific resourcesto allow simultaneous support of multiple terminals. However,transmissions by terminals in neighboring sectors are not coordinated.Consequently, transmissions by terminals at sector edges can causeinterference and degradation of terminal performance.

SUMMARY

The following presents a simplified summary of one or more embodimentsin order to provide a basic understanding of such embodiments. Thissummary is not an extensive overview of all contemplated embodiments,and is intended to neither identify key or critical elements of allembodiments nor delineate the scope of any or all embodiments. Its solepurpose is to present some concepts of one or more embodiments in asimplified form as a prelude to the more detailed description that ispresented later.

According to an aspect, a method that facilitates reverse link trafficchannel power control is described herein. The method can compriseproviding power control information in an assignment. In addition, themethod can include broadcasting an interference offset value for eachsubband utilized to establish an adjustment range. The method canfurther comprise broadcasting an other sector interference (OSI)indication that is employed to adjust a power control value.

Another aspect relates to a wireless communications apparatus that cancomprise a memory that retains instructions related to broadcastinginterference offset values for each subband, broadcasting regular OtherSector Interference (OSI) parameters and broadcasting fast OSIparameters. The wireless communications apparatus can also include aprocessor coupled to the memory and configured to execute theinstructions retained in the memory.

Yet another aspect relates to a wireless communications apparatus thatfacilitates delta-based power control. The apparatus can include meansfor providing power control information in an assignment of a mobiledevice. In addition, the apparatus can include means for broadcasting aninterference offset value for each subband. The apparatus can furthercomprise means for broadcasting an OSI indication that enablesdelta-based power control.

Still another aspect relates to a machine-readable medium having storedthereon machine-executable instructions for providing power controlinformation in an assignment. The machine readable medium can furthercomprise instructions for broadcasting an interference offset value foreach subband utilized to establish an adjustment range. In addition, themachine-readable medium can include instructions for broadcasting an OSIindication that is employed to adjust a power control value.

According to another aspect, in a wireless communication system, anapparatus can comprise an integrated circuit. The integrated circuit canbe configured to assign a reverse link traffic channel to a mobiledevice. The integrate circuit can further be configured to provide powercontrol related information in the assignment and broadcast regular andfast OSI indications to at least one mobile device to facilitatedelta-based power control.

According to yet another aspect, a method that effectuates delta-basedpower control is described herein. The method can comprise establishingan allowable range for a delta value based in part upon power controlrelated information included in an assignment. In addition, the methodcan include evaluating an adjustment to the delta value based in part onbroadcasted other sector interference (OSI) indications. The method canfurther comprise setting a power spectral density corresponding to areverse link traffic channel in accordance with the delta value.

Another aspect described herein relates to a wireless communicationsapparatus that can include a memory that retains instructions related toestablishing an allowable range for a delta value based in part uponpower control related information included in an assignment, evaluatingan adjustment to the delta value based in part on broadcasted OSIindications and setting a power spectral density corresponding to areverse link traffic channel in accordance with the delta value. Inaddition, the wireless communications apparatus can comprise anintegrated circuit coupled to the memory, configured to execute theinstructions retained in the memory.

Yet another aspect relates to a wireless communications apparatus thateffectuates delta-based power control. The apparatus can comprise meansfor establishing an allowable range for a delta value based in part uponpower control related information included in an assignment. Inaddition, the apparatus can include means for evaluating an adjustmentto the delta value based in part on broadcasted OSI indications.Further, the apparatus can comprise means for setting a power spectraldensity corresponding to a reverse link traffic channel in accordancewith the delta value.

Still another aspect relates to a machine-readable medium having storedthereon machine-executable instructions for establishing an allowablerange for a delta value based in part upon power control relatedinformation included in an assignment. The machine-readable medium canfurther include instructions for valuating an adjustment to the deltavalue based in part on broadcasted other sector interference (OSI)indications. In addition, the machine-readable medium can compriseinstructions for setting a power spectral density corresponding to areverse link traffic channel in accordance with the delta value.

A further aspect described herein relates to an integrated circuitconfigured to establish an allowable range for a delta value based inpart upon power control related information included in an assignment.In addition, the integrate circuit can be configured to determine anadjustment to the delta value based in part on broadcasted other sectorinterference (OSI) indications. Further, the integrated circuit can beconfigured to set a power spectral density corresponding to a reverselink traffic channel in accordance with the delta value.

To the accomplishment of the foregoing and related ends, the one or moreembodiments comprise the features hereinafter fully described andparticularly pointed out in the claims. The following description andthe annexed drawings set forth in detail certain illustrative aspects ofthe one or more embodiments. These aspects are indicative, however, ofbut a few of the various ways in which the principles of variousembodiments may be employed and the described embodiments are intendedto include all such aspects and their equivalents.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is an illustration of a wireless communication system inaccordance with one or more aspects presented herein.

FIG. 2 is an illustration of a wireless communication system inaccordance with various aspects set forth herein.

FIG. 2 is an illustration of an example wireless communications systemthat effectuates reverse link traffic power control according to anaspect of the subject disclosure.

FIG. 4 is an illustration of an example methodology that facilitatesreverse link power control in accordance with an aspect of the subjectdisclosure.

FIG. 5 is an illustration of an example methodology that evaluates slowdelta values based upon broadcasted interference information.

FIG. 6 is an illustration of an example methodology that facilitatesadjusting transmit power based upon broadcasted interferenceinformation.

FIG. 7 is an illustration of an example mobile device that facilitatesreverse link transmit power control.

FIG. 8 is an illustration of an example system that facilitates reverselink power control by providing power control related information.

FIG. 9 is an illustration of an example wireless network environmentthat can be employed in conjunction with the various systems and methodsdescribed herein.

FIG. 10 is an illustration of an example system that facilitates powercontrol through interference information broadcasts.

FIG. 11 is an illustration of an example system that facilitates reverselink transmit power control.

DETAILED DESCRIPTION

Various embodiments are now described with reference to the drawings,wherein like reference numerals are used to refer to like elementsthroughout. In the following description, for purposes of explanation,numerous specific details are set forth in order to provide a thoroughunderstanding of one or more embodiments. It may be evident, however,that such embodiment(s) may be practiced without these specific details.In other instances, well-known structures and devices are shown in blockdiagram form in order to facilitate describing one or more embodiments.

As used in this application, the terms “component,” “module,” “system,”and the like are intended to refer to a computer-related entity, eitherhardware, firmware, a combination of hardware and software, software, orsoftware in execution. For example, a component may be, but is notlimited to being, a process running on a processor, a processor, anobject, an executable, a thread of execution, a program, and/or acomputer. By way of illustration, both an application running on acomputing device and the computing device can be a component. One ormore components can reside within a process and/or thread of executionand a component may be localized on one computer and/or distributedbetween two or more computers. In addition, these components can executefrom various computer readable media having various data structuresstored thereon. The components may communicate by way of local and/orremote processes such as in accordance with a signal having one or moredata packets (e.g., data from one component interacting with anothercomponent in a local system, distributed system, and/or across a networksuch as the Internet with other systems by way of the signal).

Furthermore, various embodiments are described herein in connection witha mobile device. A mobile device can also be called a system, subscriberunit, subscriber station, mobile station, mobile, remote station, remoteterminal, access terminal, user terminal, terminal, wirelesscommunication device, user agent, user device, or user equipment (UE). Amobile device may be a cellular telephone, a cordless telephone, aSession Initiation Protocol (SIP) phone, a wireless local loop (WLL)station, a personal digital assistant (PDA), a handheld device havingwireless connection capability, computing device, or other processingdevice connected to a wireless modem. Moreover, various embodiments aredescribed herein in connection with a base station. A base station maybe utilized for communicating with mobile device(s) and may also bereferred to as an access point, Node B, or some other terminology.

Moreover, various aspects or features described herein may beimplemented as a method, apparatus, or article of manufacture usingstandard programming and/or engineering techniques. The term “article ofmanufacture” as used herein is intended to encompass a computer programaccessible from any computer-readable device, carrier, or media. Forexample, computer-readable media can include but are not limited tomagnetic storage devices (e.g., hard disk, floppy disk, magnetic strips,etc.), optical disks (e.g., compact disk (CD), digital versatile disk(DVD), etc.), smart cards, and flash memory devices (e.g., EPROM, card,stick, key drive, etc.). Additionally, various storage media describedherein can represent one or more devices and/or other machine-readablemedia for storing information. The term “machine-readable medium” caninclude, without being limited to, wireless channels and various othermedia capable of storing, containing, and/or carrying instruction(s)and/or data.

Referring now to FIG. 1, a wireless communication system 100 inaccordance with various aspects presented herein is illustrated. System100 can comprise one or more access points 102 that receive, transmit,repeat, etc., wireless communication signals to each other and/or to oneor more terminals 104. Each base station 102 can comprise multipletransmitter chains and receiver chains, e.g., one for each transmit andreceive antenna, each of which can in turn comprise a plurality ofcomponents associated with signal transmission and reception (e.g.,processors, modulators, multiplexers, demodulators, demultiplexers,antennas, etc.). Terminals 104 can be, for example, cellular phones,smart phones, laptops, handheld communication devices, handheldcomputing devices, satellite radios, global positioning systems, PDAs,and/or any other suitable device for communicating over wireless system100. In addition, each terminal 104 can comprise one or more transmitterchains and receiver chains, such as used for a multiple input multipleoutput (MIMO) system. Each transmitter and receiver chain can comprise aplurality of components associated with signal transmission andreception (e.g., processors, modulators, multiplexers, demodulators,demultiplexers, antennas, etc.), as will be appreciated by one skilledin the art.

As illustrated in FIG. 1, each access point provides communicationcoverage for a particular geographic area 106. The term “cell” can referto an access point and/or its coverage area, depending on context. Toimprove system capacity, an access point coverage area can bepartitioned into multiple smaller areas (e.g., three smaller areas 108A,108B and 108C). Each smaller area is served by a respective basetransceiver subsystem (BTS). The term “sector” can refer to a BTS and/orits coverage area depending upon context. For a sectorized cell, thebase transceiver subsystem for all sectors of the cell is typicallyco-located within the access point for the cell.

Terminals 104 are typically dispersed throughout system 100. Eachterminal 104 may be fixed or mobile. Each terminal 104 may communicatewith one or more access points 102 on the forward and reverse links atany given moment.

For a centralized architecture, a system controller 110 couples accesspoints 102 and provides coordination and control of access points 102.For a distributed architecture, access points 102 may communicate withone another as needed. Communication between access points via systemcontroller 110 or the like can be referred to as backhaul signaling.

The techniques described herein may be used for a system 100 withsectorized cells as well as a system with un-sectorized cells. Forclarity, the following description is for a system with sectorizedcells. The term “access point” is used generically for a fixed stationthat serves a sector as well as a fixed station that serves a cell. Theterms “terminal” and “user” are used interchangeably, and the terms“sector” and “access point” are also used interchangeably. A servingaccess point/sector is an access point/sector with which a terminal hasreverse link traffic transmissions. A neighbor access point/sector is anaccess point/sector with which a terminal does not have reverse linktraffic transmissions. For example, an access point only serving theforward link to a terminal should be considered a neighbor sector forinterference management purposes.

Referring now to FIG. 2, a wireless communication system 200 isillustrated in accordance with various embodiments presented herein.System 200 comprises a base station 202 that may include multipleantenna groups. For example, one antenna group may include antennas 204and 206, another group may comprise antennas 208 and 210, and anadditional group may include antennas 212 and 214. Two antennas areillustrated for each antenna group; however, more or fewer antennas maybe utilized for each group. Base station 202 may additionally include atransmitter chain and a receiver chain, each of which can in turncomprise a plurality of components associated with signal transmissionand reception (e.g., processors, modulators, multiplexers, demodulators,demultiplexers, antennas, etc.), as will be appreciated by one skilledin the art.

Base station 202 may communicate with one or more mobile devices such asmobile device 216 and mobile device 222; however, it is to beappreciated that base station 202 may communicate with substantially anynumber of mobile devices similar to mobile devices 216 and 222. Mobiledevices 216 and 222 can be, for example, cellular phones, smart phones,laptops, handheld communication devices, handheld computing devices,satellite radios, global positioning systems, PDAs, and/or any othersuitable device for communicating over wireless communication system200. As depicted, mobile device 216 is in communication with antennas212 and 214, where antennas 212 and 214 transmit information to mobiledevice 216 over a forward link 218 and receive information from mobiledevice 216 over a reverse link 220. Moreover, mobile device 222 is incommunication with antennas 204 and 206, where antennas 204 and 206transmit information to mobile device 222 over a forward link 224 andreceive information from mobile device 222 over a reverse link 226. In afrequency division duplex (FDD) system, forward link 218 may utilize adifferent frequency band than that used by reverse link 220, and forwardlink 224 may employ a different frequency band than that employed byreverse link 226, for example. Further, in a time division duplex (TDD)system, forward link 218 and reverse link 220 may utilize a commonfrequency band and forward link 224 and reverse link 226 may utilize acommon frequency band.

The set of antennas and/or the area in which they are designated tocommunicate may be referred to as a sector of base station 202. Forexample, multiple antennas may be designed to communicate to mobiledevices in a sector of the areas covered by base station 202. Incommunication over forward links 218 and 224, the transmitting antennasof base station 202 may utilize beamforming to improve signal-to-noiseratio of forward links 218 and 224 for mobile devices 216 and 222. Also,while base station 202 utilizes beamforming to transmit to mobiledevices 216 and 222 scattered randomly through an associated coverage,mobile devices in neighboring cells may be subject to less interferenceas compared to a base station transmitting through a single antenna toall its mobile devices.

According to an example, system 200 may be a multiple-inputmultiple-output (MIMO) communication system. Further, system 200 mayutilize any type of duplexing technique to divide communication channels(e.g., forward link, reverse link, . . . ) such as FDD, TDD, and thelike. Moreover, system 200 may employ information broadcasts toeffectuate dynamic power control for the reverse links. Pursuant to anillustration, base station 202 may transmit power control relatedinformation over forward links 218 and 224 to mobile devices 216 and222. The power control related information can be included in a reverselink data channel assignment provided to the mobile devices 216 and 222.Base station 202 may broadcast other sector interference indications.For example, base station 202 may broadcast regular other sectorinterference values every superframe and fast other sector interferencevalues for every subband on every reverse link frame. The other sectorinterference is broadcasted to mobile devices (not shown) in othersectors not served by base station 202. Additionally, mobile devices 216and 222 receive the broadcasted other sector interference values frombase stations other than base station 202. Mobile devices 216 and 222may also receive the power control related information included in theassignment from base station 202. Accordingly, mobile device 216 and 222can employ the received other sector interference values and powercontrol information to adjust power on a reverse link data channels. Forexample, mobile devices 216 and 222 may utilize fast other sectorinterference values to maintain and adjust transmit delta valuesemployed to regulate power spectral density of the reverse link datachannels. In addition, mobile devices 216 and 222 may employ regularother sector interference values to maintain and adjust slow deltavalues that may be communication to base station 202 via reverse links220 and 226, respectively. The slow delta values may be employed by basestation 202 as suggested values for future assignments.

Turning now to FIG. 3, illustrated is a wireless communications system300 that effectuates reverse link transmit power control based uponconsiderations of broadcasted interference values, among other things.System 300 includes a base station 302 that communicates with a mobiledevice 304 (and/or any number of disparate mobile devices (not shown)).Base station 302 may transmit power control related information tomobile device 304 over a forward link channel and broadcast other sectorinterference values to mobile devices located in other sectors notserved by base station 302. Further base station 302 may receiveinformation from mobile device 304 over a reverse link channel.Moreover, system 300 may be a MIMO system.

Base station 302 may include a scheduler 306, an other sectorinterference (OSI) broadcaster 308 and an interference offsetbroadcaster 310. Scheduler 306, among other things, provides a channelassignment to mobile device 304. The assignment may include a channel IDthat specifies a set of hop ports via a channel tree. The assignment mayalso specify a packet format. The packet format can be the coding and/ormodulation to be employed for transmissions on the assigned resources.Moreover, the assignment may include parameters that indicate theassignment is an extended transmission duration assignment and/orwhether the assignment should replace or supplement an existingassignment. In accordance with an aspect of the subject disclosure, eachpacket format has an associated minimum carrier-to-interference (C/I)value for a data channel (hereinafter referred to as DataCtoI_(min)).The DataCtoI_(min) value corresponds to the minimum C/I required toachieve a certain error rate at a particular hybrid automatic repeatrequest (HARQ) attempt. In addition, scheduler 306 conveys a minimum andmaximum carrier over thermal values for a data channel (hereinafterreferred to as DataCoT_(min) and DataCoT_(max)). These values may beincluded in the assignment issued by scheduler 306 of base station 302to mobile device 304. Further, the assignment from scheduler 306 mayinclude a C/I value for a data channel that is assigned to mobile device304, DataCtoI_(assigned). This value is selected based on a target HARQtermination. According to one aspect of the subject disclosure, areserved value of DataCtoI_(assigned) can be employed to instruct mobiledevices to utilize its current delta value on the assignment interlace.Furthermore, scheduler 306 determines a maximum delta increase value(MaxDeltaIncrease) and a maximum delta reduction value(MaxDeltaReduction) per quality of service (QoS) class. While theseaforementioned parameters (e.g. DataCtoI_(min), DataCoT_(min),DataCoT_(max), DataCtoI_(assigned) step sizes, etc.) are assigned bybase station 304, it is to be appreciated that the parameters need notbe assigned through the same mechanisms or at the same time. Forexample, DataCoT_(min), DataCoT_(max), and step size may be semi-staticparameters that need not be assigned for each packet or assignment.These parameters may be updated through upper layer messages or the likewhenever an update is needed.

These values may be utilized by mobile device 304 in power controldecisions. For example, the parameters may be employed to establish arange of transmit delta adjustments. The range may be specified in aplurality of ways. According to one aspect, explicit DataCtoI_(min) andDataCtoI_(max) values can be assigned and utilized to establish therange. In addition, relative bounds can be employed, for example,through parameters specifying maximum reduction or increase in the deltaor C/I values. By way of illustration, a MaxDeltaIncrease and aMaxDeltaReduction parameter can be utilized. According to anotherillustration, a MaxCtoIIncrease value and a MaxCtoIReduction value maybe employed. It is to be appreciated that combinations may also bepossible (e.g., MaxDeltaIncrease and MaxCtoIReduction).

Scheduler 306 assigns resources (channels, frequencies, bandwidth, etc.)to mobile device 304. Base station 302, employing scheduler 306, makesassignment decisions based upon various considerations. For example, theassignment decision may factor information received over the reverserequest channel (R-REQCH). The request may include a buffer size or aquality of service (QoS) level. In addition, the scheduler 306 may basethe assignment decision on other feedback information received frommobile device 304. Scheduler 306 may account for received feedbackinformation such as a slow delta value that serves as a suggested valuefor future assignments. The feedback information may further includepower amplifier headroom, an indication of fast OSI activity and thelike.

Base station 302 further includes OSI broadcaster 308 that broadcastsother sector interference information to mobile devices in the othersectors not served by base station 302. At every superframe, basestation 302 employs OSI broadcaster 308 to broadcast a regular OSI valueto mobile devices. The regular OSI value represents an averageinterference observed during the previous superframe. It is to beappreciated that more than one previous superframe may be averaged. Byway of example and not limitation, the regular OSI value may comprisethe average interference observed during the previous three superframes.In accordance with an aspect, the regular OSI value may be broadcastedon a broadcast channel such as the forward link OSI pilot channel(F-OSICH). In addition, the regular OSI indication may be transmitted onthe superframe preamble of every superframe. Delta-based power controlby mobile device 304 based upon the regular OSI indications from basestations in other sectors can result in tight interference distributionsin full-buffer scenarios.

In bursty traffic situations, more dynamic control of power levels maybe required. Accordingly, OSI broadcaster 308 also broadcasts a fast OSIvalue received by mobile device 304 and other mobile devices served bybase station 302. The fast OSI indication may be broadcasted over a fastOSI channel (F-FOSICH) on the forward link control segment. By way ofexample and not limitation, the fast OSI reports may be grouped incollections of four bits each and each collection may be transmittedutilizing six modulation symbols similar to data transmission over theforward pilot quality indicator channel (F-PQICH). In this example,erasure may be mapped to the all zero sequence such that there is nofast OSI indication on any of the involved subbands. The fast OSI valuecan be broadcasted for every subband on each interlace of every reverselink frame. The fast OSI value may be based upon interference observedover a particular subband on a certain reverse link frame.

Base station 302 further includes interference offset broadcaster 310.To reduce packet errors in the event of large interference over thermal(IoT) rise due to bursty traffic in the neighboring sectors, basestation 302, via interference offset broadcaster 310, may employ fastIoT reports. Base station 302 may further employ scheduler 306 tofacilitate dynamic adjustments of the minimum allowed delta value foreach assignment as described infra. Interference offset broadcastertransmits an interference offset value, InterferenceOffset_(s) for everysubband, s. This value is based at least in part upon an amount ofinterference observed by base station 302 on subband s filtered acrossinterlaces. This value can be transmitted over the forward interferenceover thermal channel (F-IOTCH).

In addition to the above described reports, base station 302 may furthertransmit quantized information about received control pilotcarrier-over-thermal (CoT) power spectral density (PSD) for mobiledevice 304, if active, and for all active mobile devices in the sectorserved by base station 302. This information may be transmitted overF-PQICH. This information and the above described values can be employedby mobile device 304 in performing delta-based power control. Accordingto an aspect of the subject disclosure, mobile device 304 maintains andadjusts a slow delta value and a transmit delta value.

A delta value is an offset between a PSD of a control pilot and atraffic PSD. The delta value is related to a received C/I value (e.g.,DataCtoI) through a control pilot carrier-over-thermal PSD (pCoT) and atraffic interference-over-thermal PSD (IoT). For example, a delta valuemay be mapped to a data C/I value according to the following:

Δ=CoT_(data)−CoT_(control)

Δ=CoI_(data)+IoT_(data)−CoT_(control)

Pursuant to this illustration, CoT_(data) is a carrier-over-thermalvalue of a data or traffic channel. The value, CoT_(control), is acarrier-over-thermal value for a control channel such as the pilotchannel PSD value (pCoT) received from a base station. Accordingly, thedelta value, Δ, is the difference or offset between the control and thetraffic PSD values. CoT_(data) is equivalent to the sum of the C/I valuefor the data channel, CoI_(data), and the interference-over-thermalvalue for the data channel, IoT_(data). CoI_(data) can be the DataCtoIvalue assigned to a mobile device by a base station as described supra.In addition, IoT_(data) can be the interference offset value transmittedby the base station.

Mobile device 304 maintains and adjusts delta values in accordance witha delta value range. The delta value range is established by mobiledevice 304 based upon broadcasted information received or informationincluded in the assignment from base station 302. For example, mobiledevice 304 sets a minimum slow delta value, Δ_(slow,min), and a maximumslow delta value, Δ_(slow,max), based upon the following:

Δ_(slow)=DataCoT_(min)−pCoT_(RLSS)

Δ_(slow,max)=DataCoT_(max)−pCoT_(RLSS)

The values DataCoT_(min) and DataCoT_(max) are minimum and maximum,respectively, carrier-over-thermal PSD values for a traffic channelprovided by base station 302 as part of the assignment. The valuepCoT_(RLSS) is the carrier-over-thermal PSD value for a pilot channel ofthe reverse link serving sector. Thus, mobile device 304 sets a slowdelta value range based upon indications broadcasted or assigned by basestation 302.

Mobile device 304 includes a slow delta evaluator 312 that maintains andadjusts a slow delta value, Δ_(slow). Slow delta evaluator 312determines and adjusts the slow delta value based upon the regular OSIindications broadcasted by an other sector base station similar to basestation 302. At every superframe, slow delta evaluator 312 generates anOSI monitor set. The OSI monitor set is formed by applying a thresholdvalue to forward link geometries of sectors mobile device 304 canacquire. Additionally, the OSI monitor set may be formed b y applying athreshold value to chandiff values of other sectors. It is to beappreciated that a separate monitor set can be generated for othersector base stations broadcasting fast OSI indications. The fast OSImonitor set may be restricted to members of the active set of mobiledevice 304. The sector comprising the reverse link serving sector ofmobile device 304 is not include in the OSI monitor set. The OSI monitorset includes sectors that may be affected by interference caused bymobile device 304. For each member of the OSI monitor set, slow deltaevaluator 312 computes chandiff values. The chandiff values are basedupon received power on an acquisition pilot while taking into accountthe transmit power of each sector in the monitor set. Slow deltaevaluator 312 adjusts the slow delta value based in part on the regularOSI values broadcasted from members of the OSI monitor set. Slow deltaevaluator 312 further considers the corresponding chandiff valuescomputed as well as the current slow delta value of mobile device 304.The slow delta value is adjusted with the constraint that the value doesnot fall below the minimum value nor exceeds the maximum value. Mobiledevice 304 communicates the adjusted slow delta value to base station302, the reverse link serving base station. The communicated value isemployed as a suggested value for future assignments by base station302.

Mobile device 304 further includes transmit delta evaluator 314 thatmaintains and adjusts a transmit delta value, Δ_(tx). Transmit deltaevaluator 314 determines and alters the transmit delta value based uponthe fast OSI indications broadcasted by an other sector base stationsimilar to base station 302. The adjustment can be per subband when thefast OSI indications are also per dsubband. After assignment on subband,s, with an explicit DataCtoI_(assigned) provided by scheduler 306 ofbase station 302, transmit delta evaluator 314 establishes a range forthe transmit delta value. For each packet (or sub-packet), p, to betransmitted on subband s, transmit delta evaluator 314 establishes aminimum delta value, Δ_(min,p), and an assigned or maximum delta value,Δ_(max,p), according to the following:

Δ_(min,p)=InterferenceOffset_(RLSS,s)−pCoT_(RLSS)+DataCtoI_(min,p)

Δ_(max,p)=InterferenceOffset_(RLSS,s)−pCoT_(RLSS)+DataCtoI_(assigned,p)

Pursuant to this illustration, the value, InterferenceOffset_(RLSS,s),is an indication of the interference over thermal level for subband s inthe reverse link serving sector. This value is broadcasted by basestation 302 and received by mobile device 304. The value, pCoT_(RLSS),is the pilot CoT PSD in the reverse link serving sector for mobiledevice 304. The value, DataCtoI_(min,p), is the minimum C/I valuecorresponding to packet, p. Mobile device 304 receives the value,DataCtoI_(assigned,p), in the assignment from scheduler 306 in basestation 302. Transmit delta evaluator 314 utilizes the most recent(i.e., un-erased) values of InterferenceOffset and pCoT. Further, adefault sector-specific interference over thermal value may be utilizedby transmit delta evaluator 314 if the channel conveying theinterference offset is erased for a number of report intervals.

After establishing the range for transmit delta value, Δ_(tx), transmitdelta evaluator 314 adjusts the value based upon the fast OSIindications broadcasted by neighboring sectors and received by mobiledevice 304. Initially, the transmit delta value is initialized toΔ_(max), as evaluated supra. After initialization, the transmit deltavalue is adjusted by stepping the value up or down based uponconsideration of the broadcasted fast OSI indications. For aretransmission on interlace, i, transmit delta evaluator 314 adjust thetransmit delta value in response to fast OSI indications correspondingto the previous transmission on that interlace. The adjustment may beeffectuated according to the following:

$\Delta_{tx} = \{ \begin{matrix}{\Delta_{tx} + {fastOSIStepUp}} & {{{if}\mspace{14mu} {all}\mspace{14mu} {fastOSI}_{i}} = 0} \\{\Delta_{tx} - {fastOSIStepDown}} & {{{if}\mspace{14mu} {any}\mspace{14mu} {fastOSI}_{i}} = 1}\end{matrix} $

Pursuant to this example, the value, fastOSI_(i), is the fast OSIindications received corresponding to interlace i. The values,fastOSIStepUp and fastOSIStepDown, are a transmit delta value step upsize and step down size respectively. The adjustment is made by transmitdelta evaluator 314 with the constraint that the transmit delta valuedoes not exceed Δ_(max) and does not fall below Δ_(min). For new packetsor for new assignments not including any explicit DataCtoI_(assigned)value, the transmit delta value is not initialized to Δ_(max). Rather,transmit delta evaluator 314 utilizes the most recent transmit deltavalue and performs the same adjustments as described above.

According to another aspect of the subject disclosure, mobile device 304includes PSD regulator 316 that sets the transmit PSD of an assignedreverse link data channel (e.g., R-DCH) for every assignment. It is tobe appreciated that the transmit PSD may be set every subband when thetransmit delta value and fast OSI indications are per subband. Thetransmit PSD for the data channel is established in accordance with thefollowing:

PSD_(R-DCH)=PSD_(R-PICH)+Δ_(tx)+AttemptBoost_(j)

Pursuant to an illustration, j is the sub packet index, and the boostvalues, AttemptBoost_(j), are assigned by base station 302. The value,PSD_(R-PICH), is the PSD of the reverse link pilot channel. If theresultant transmit power is larger than the maximum transmit poweravailable for traffic, PSD regulator 316 scales the data PSD such thatthe total transmit power is the maximum transmit power.

Further, in accordance with another aspect of the subject disclosure,mobile device 304 provides feedback to base station 302. Mobile device304 may communicated out-of-band reports and in-band reports.Out-of-band reports may include information related tocarrier-over-thermal values or chandiff values. For example, mobiledevice 304 may communicate a maximum achievable received CoT value overthe entire band. The CoT value may be an indication of PA headroom. Thisvalue may be calculated utilizing the pilot CoT feedback received on thepilot quality indicator channel of the forward link. According to anexample, this value is only transmitted after substantial change fromthe previous report. In addition, mobile device 304 may report achandiff value to base station 302. Similar to the reported CoT value,this value may only be reported after a substantial change.

In addition to an in-band request, mobile device 304 may report powercontrol related information. For example, mobile device 304 may report apower amplifier headroom value, a slow delta value or a transmit deltavalue corresponding to the most recent adjusted value. Similar to theout-of-band reports, these reports may be transmitted after asignificant change with respect to the previous report.

Referring to FIGS. 4-6, methodologies relating to reverse link poweradjustment based upon broadcasted interference information. While, forpurposes of simplicity of explanation, the methodologies are shown anddescribed as a series of acts, it is to be understood and appreciatedthat the methodologies are not limited by the order of acts, as someacts may, in accordance with one or more embodiments, occur in differentorders and/or concurrently with other acts from that shown and describedherein. For example, those skilled in the art will understand andappreciate that a methodology could alternatively be represented as aseries of interrelated states or events, such as in a state diagram.Moreover, not all illustrated acts may be required to implement amethodology in accordance with one or more embodiments.

Turning now to FIG. 4, illustrated is a methodology 400 that facilitatesreverse link transmit power control. In accordance with an aspect of thesubject disclosure, methodology 400 may be carried out by a basestation. Method 400 can be employed to provide mobile devices withparameters relevant in power control decisions, among other things. Atreference numeral 402, power control parameters are included in anassignment. An assignment, for example, may be an allocation offrequency resources or a designation of a reverse link data channel to aparticular mobile device. The power control parameters may include aminimum and maximum carrier-over-thermal value for the reverse link datachannel. In addition, the power control parameters may include anassigned or target C/I value relevant to a particular subband to which amobile device is to be assigned. The power control parameters may not beincluded in every assignment as semi-static parameters may only beassigned when the parameters require updating. At reference 404, mobiledevices are assigned. The assignment decisions may be based in part onfeedback information received from mobile devices. The feedbackinformation may include delta values (e.g., slow delta values andtransmit delta values), power amplifier headroom, a buffer size, a QoSlevel, maximum allowed power based upon projected interference and/or areport of excessive fast OSI activity.

At reference numeral 406, a regular OSI indication is broadcasted. Thebroadcast may occur once every superframe and the indication may beincluded in the superframe preamble. The regular OSI indication is anaverage interference observed during the previous superframe(s). Thisvalue facilitates determining a slow delta value. At reference numeral408, a fast OSI indication is broadcasted. The broadcast may occur forevery subband on every reverse link frame. The fast OSI indicationrepresents interference observed over a certain subband on a particularreverse link frame. The fast OSI indication facilitates determining atransmit delta value. At reference numeral 410, an interference offsetvalue is broadcasted. An interference offset value is broadcasted forevery subband. The value represents amount of interference observed on aparticular subband filtered across interlaces. For example, theinterference offset value may represent an IoT level of a subband.

Turning to FIG. 5, illustrated is a methodology 500 that effectuatesreverse link power control in wireless communications. Method 500 can beemployed by a mobile device to, among other things, generate a slowdelta value utilized by a base station for future assignment decisions.At reference numeral 502, a range for a slow delta value is determined.The range may be based upon parameters included in an assignment. Forexample, a range may be computed based upon considerations of theminimum and maximum CoT values included in the assignment as well as aPSD of a pilot channel. The range defines minimum and maximum values fora slow delta value such that adjustments to the slow delta value areconstrained within the range. These values may also be included in aprevious assignment and not the most current. For example, certainparameters may be semi-static and only require periodic updating. Atreference numeral 504, a slow delta value is evaluated or adjusted. Thevalue is evaluated based upon regular OSI broadcasts from members of amonitor set. In addition, chandiff values corresponding to the monitorset members as well as a current slow delta value may be considered. Atreference numeral 506, the adjusted slow delta value is transmitted. Thevalue may be communicated to a base station serving a reverse link of amobile device to be employed in future assignment decisions.

With reference to FIG. 6, illustrated is a methodology 600 thateffectuates reverse link power adjustment. Method 600 may be employed bya mobile device in a wireless communications system to set a PSD for areverse link traffic channel. At reference numeral 602, a range for atransmit delta value is established. The range may be based upon valuesincluded in an assignment. In addition, the range may be determinedbased upon considerations of interference offset values as well as a CoTvalue of a pilot channel. At reference numeral 604, a transmit deltavalue is evaluated or adjusted. The adjustment may be based upon fastOSI indications broadcasted. For example, the transmit delta value maybe initialized to a maximum value and then adjusted up or down by anassigned step size depending on the fast OSI indications. An indicationof increased interference in other sectors typically results in a stepdown of the transmit delta value while no indications may result in astep up of transmit delta value. At reference numeral 606, a powerspectral density of a reverse link traffic channel is set. The PSD isestablished based upon the transmit delta value. For example, inaccordance with an aspect of the subject disclosure, the traffic channelPSD is set to the sum of a PSD of a pilot channel and the transmit deltavalue. In addition, assigned boost values may be included in the sum.

It will be appreciated that, in accordance with one or more aspectsdescribed herein, inferences can be made regarding assigning mobiledevices, generating OSI monitor sets, determining chandiff values,evaluating slow delta values, etc. As used herein, the term to “infer”or “inference” refers generally to the process of reasoning about orinferring states of the system, environment, and/or user from a set ofobservations as captured via events and/or data. Inference can beemployed to identify a specific context or action, or can generate aprobability distribution over states, for example. The inference can beprobabilistic—that is, the computation of a probability distributionover states of interest based on a consideration of data and events.Inference can also refer to techniques employed for composinghigher-level events from a set of events and/or data. Such inferenceresults in the construction of new events or actions from a set ofobserved events and/or stored event data, whether or not the events arecorrelated in close temporal proximity, and whether the events and datacome from one or several event and data sources.

According to an example, one or more methods presented above can includemaking inferences pertaining to assigning mobile devices based uponconsiderations of slow delta values transmitted to a base station by themobile devices. By way of further illustration, an inference may be maderelated to determining adjustments to a slow delta value based uponregular OSI indications, chandiff values and a current delta value. Itwill be appreciated that the foregoing examples are illustrative innature and are not intended to limit the number of inferences that canbe made or the manner in which such inferences are made in conjunctionwith the various embodiments and/or methods described herein.

FIG. 7 is an illustration of a mobile device 700 that facilitatesadjusting reverse link power based upon considerations of broadcastedinterference information. Mobile device 700 comprises a receiver 702that receives a signal from, for instance, a receive antenna (notshown), and performs typical actions thereon (e.g., filters, amplifies,downconverts, etc.) the received signal and digitizes the conditionedsignal to obtain samples. Receiver 702 can be, for example, an MMSEreceiver, and can comprise a demodulator 704 that can demodulatereceived symbols and provide them to a processor 706 for channelestimation. Processor 706 can be a processor dedicated to analyzinginformation received by receiver 702 and/or generating information fortransmission by a transmitter 716, a processor that controls one or morecomponents of mobile device 700, and/or a processor that both analyzesinformation received by receiver 702, generates information fortransmission by transmitter 716, and controls one or more components ofmobile device 700.

Mobile device 700 can additionally comprise memory 708 that isoperatively coupled to processor 706 and that may store data to betransmitted, received data, information related to available channels,data associated with analyzed signal and/or interference strength,information related to an assigned channel, power, rate, or the like,and any other suitable information for estimating a channel andcommunicating via the channel. Memory 708 can additionally storeprotocols and/or algorithms associated with estimating and/or utilizinga channel (e.g., performance based, capacity based, etc.).

It will be appreciated that the data store (e.g., memory 708) describedherein can be either volatile memory or nonvolatile memory, or caninclude both volatile and nonvolatile memory. By way of illustration,and not limitation, nonvolatile memory can include read only memory(ROM), programmable ROM (PROM), electrically programmable ROM (EPROM),electrically erasable PROM (EEPROM), or flash memory. Volatile memorycan include random access memory (RAM), which acts as external cachememory. By way of illustration and not limitation, RAM is available inmany forms such as synchronous RAM (SRAM), dynamic RAM (DRAM),synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhancedSDRAM (ESDRAM), Synchlink DRAM (SLDRAM), and direct Rambus RAM (DRRAM).The memory 708 of the subject systems and methods is intended tocomprise, without being limited to, these and any other suitable typesof memory.

Receiver 702 is further operatively coupled to a slow delta evaluator710 that determines a slow delta value for mobile device 700. Slow deltaevaluator 710 maintains and adjusts the slow delta value based uponconsiderations of regular OSI indications that are broadcasted by basestations and received at mobile device 700 by receiver 702. Slowevaluator 710 establishes an OSI monitor set by applying a thresholdvalue to forward link geometries of sector that mobile device 700 canacquire other than a reverse link serving sector. Chandiff values arecomputed for each member of the set. The slow delta value is adjustedbased upon the OSI monitor set, chandiff values and/or regular OSIindications. Additionally, the slow delta value may be transmitted bymobile device 700 to provide a suggested value for future assignments bya reverse link serving base station. Additionally, receiver 702 iscoupled to a transmit delta evaluator 712 that determines a transmitdelta value for mobile device 700. Transmit delta evaluator 712maintains and adjusts the transmit delta value based upon considerationsof fast OSI indications broadcasted by base stations and received atmobile device 700 by receiver 702. Transmit delta evaluator 712, afterinitializing the transmit delta value to a maximum, steps up or stepsdown the transmit delta value based upon the fast OSI indications.Mobile device 700 may transmit the adjusted value to a serving basestation as feedback.

Mobile device 700 still further comprises a modulator 714 andtransmitter 716 that transmits a signal (e.g., power limitationindicators) to, for instance, a base station, another mobile device,etc. A PSD regulator 718 is coupled to processor 706 and transmitter716. PSD regulator established the power spectral density of a reverselink traffic channel assigned to mobile device 700 based in part on thetransmit delta value maintained and adjusted by transmit delta evaluator712 and a PSD of a pilot channel. Although depicted as being separatefrom the processor 706, it is to be appreciated that slow deltaevaluator 710, transmit delta evaluator 712, PSD regulator 718 and/ormodulator 714 may be part of processor 706 or a number of processors(not shown).

FIG. 8 is an illustration of a system 800 that facilitates reverse linkpower control through providing power control related information tomobile devices in a wireless communications system. System 800 comprisesa base station 802 (e.g., access point, . . . ) with a receiver 810 thatreceives signal(s) from one or more mobile devices 904 through aplurality of receive antennas 806, and a transmitter 820 that transmitsto the one or more mobile devices 804 through a transmit antenna 808.Receiver 810 can receive information from receive antennas 806 and isoperatively associated with a demodulator 812 that demodulates receivedinformation. Demodulated symbols are analyzed by a processor 814 thatcan be similar to the processor described above with regard to FIG. 7,and which is coupled to a memory 816 that stores information related toestimating a signal (e.g., pilot) strength and/or interference strength,data to be transmitted to or received from mobile device(s) 804 (or adisparate base station (not shown)), and/or any other suitableinformation related to performing the various actions and functions setforth herein.

Processor 814 is further coupled to a scheduler 818 that assigns mobiledevice 804 to reverse link traffic channels. Scheduler 818 makes anassignment decision based up considerations of buffer size, QoS leveland feedback information. Feedback information may include delta values(e.g., transmit delta value and slow delta value) received from mobiledevices 804. In addition, feedback information may include poweramplifier headroom and indications of excessive fast OSI activity.Scheduler 818 includes power control related information in theassignment. For example, scheduler 818 may include target C/I values,minimum and maximum CoT values, step sizes, etc. While theseaforementioned parameters are assigned by base station 80, it is to beappreciated that the parameters need not be assigned through the samemechanisms or at the same time. For example, step sizes andminimum/maximum CoT values may be semi-static parameters that need notbe assigned for each packet or assignment. These parameters may beupdated through upper layer messages or the like whenever an update isneeded. These values may be utilized by mobile devices 804 in powercontrol decisions.

Processor 814 is further coupled to a broadcaster 820. Broadcaster 820broadcasts information to mobile devices 804. The information isrelevant to power control decisions to be made by mobile devices 804.For example, broadcasted information may include regular OSI indicationsbroadcasted every superframe wherein the regular OSI indicationsrepresent average interference observed during the previous one or moresuperframes. Broadcaster 820 may further broadcast fast OSI indicationscorresponding to every subband. These indications represent interferenceobserved over the subbands. In addition, broadcaster 820 may broadcastinterference offset values that are based upon amount of interferenceobserved on each subband filtered across interlaces. Modulator 822 canmultiplex the control information for transmission by a transmitter 824through antenna 808 to mobile device(s) 804. Mobile devices 804 can besimilar to mobile device 700 described with reference to FIG. 7 andemploy broadcasted information to adjust transmit power. It should beappreciated that other functions can be utilized in accordance with thesubject disclosure. Although depicted as being separate from theprocessor 814, it is to be appreciated that scheduler 818, broadcaster820 and/or modulator 822 may be part of processor 814 or a number ofprocessors (not shown).

FIG. 9 shows an example wireless communication system 900. The wirelesscommunication system 900 depicts one base station 910 and one mobiledevice 950 for sake of brevity. However, it is to be appreciated thatsystem 900 may include more than one base station and/or more than onemobile device, wherein additional base stations and/or mobile devicesmay be substantially similar or different from example base station 910and mobile device 950 described below. In addition, it is to beappreciated that base station 910 and/or mobile device 950 may employthe systems (FIGS. 1-3, and 7-8) and/or methods (FIGS. 4-6) describedherein to facilitate wireless communication there between.

At base station 910, traffic data for a number of data streams isprovided from a data source 912 to a transmit (TX) data processor 914.According to an example, each data stream may be transmitted over arespective antenna. TX data processor 914 formats, codes, andinterleaves the traffic data stream based on a particular coding schemeselected for that data stream to provide coded data.

The coded data for each data stream may be multiplexed with pilot datausing orthogonal frequency division multiplexing (OFDM) techniques.Additionally or alternatively, the pilot symbols can be frequencydivision multiplexed (FDM), time division multiplexed (TDM), or codedivision multiplexed (CDM). The pilot data is typically a known datapattern that is processed in a known manner and may be used at mobiledevice 950 to estimate channel response. The multiplexed pilot and codeddata for each data stream may be modulated (e.g., symbol mapped) basedon a particular modulation scheme (e.g., binary phase-shift keying(BPSK), quadrature phase-shift keying (QPSK), M-phase-shift keying(M-PSK), M-quadrature amplitude modulation (M-QAM), etc.) selected forthat data stream to provide modulation symbols. The data rate, coding,and modulation for each data stream may be determined by instructionsperformed or provided by processor 930.

The modulation symbols for the data streams may be provided to a TX MIMOprocessor 920, which may further process the modulation symbols (e.g.,for OFDM). TX MIMO processor 920 then provides N_(T) modulation symbolstreams to N_(T) transceivers (TMTR/RCVR) 922 a through 922 t. Invarious embodiments, TX MIMO processor 920 applies beamforming weightsto the symbols of the data streams and to the antenna from which thesymbol is being transmitted.

Each transceiver 922 receives and processes a respective symbol streamto provide one or more analog signals, and further conditions (e.g.,amplifies, filters, and upconverts) the analog signals to provide amodulated signal suitable for transmission over the MIMO channel.Further, N_(T) modulated signals from transceiver 922 a through 922 tare transmitted from N_(T) antennas 924 a through 924 t, respectively.

At mobile device 950, the transmitted modulated signals are received byN_(R) antennas 952 a through 952 r and the received signal from eachantenna 952 is provided to a respective transceiver (TMTR/RCVR) 954 athrough 954 r. Each transceiver 954 conditions (e.g., filters,amplifies, and downconverts) a respective signal, digitizes theconditioned signal to provide samples, and further processes the samplesto provide a corresponding “received” symbol stream.

An RX data processor 960 may receive and process the N_(R) receivedsymbol streams from N_(R) transceivers 954 based on a particularreceiver processing technique to provide N_(T) “detected” symbolstreams. RX data processor 960 may demodulate, deinterleave, and decodeeach detected symbol stream to recover the traffic data for the datastream. The processing by RX data processor 960 is complementary to thatperformed by TX MIMO processor 920 and TX data processor 914 at basestation 910.

A processor 970 may periodically determine which precoding matrix toutilize as discussed above. Further, processor 970 may formulate areverse link message comprising a matrix index portion and a rank valueportion.

The reverse link message may comprise various types of informationregarding the communication link and/or the received data stream. Thereverse link message may be processed by a TX data processor 938, whichalso receives traffic data for a number of data streams from a datasource 936, modulated by a modulator 980, conditioned by transceivers954 a through 954 r, and transmitted back to base station 910.

At base station 910, the modulated signals from mobile device 950 arereceived by antennas 924, conditioned by transceivers 922, demodulatedby a demodulator 940, and processed by a RX data processor 942 toextract the reverse link message transmitted by mobile device 950.Further, processor 930 may process the extracted message to determinewhich precoding matrix to use for determining the beamforming weights.

Processors 930 and 970 may direct (e.g., control, coordinate, manage,etc.) operation at base station 910 and mobile device 950, respectively.Respective processors 930 and 970 can be associated with memory 932 and972 that store program codes and data. Processors 930 and 970 can alsoperform computations to derive frequency and impulse response estimatesfor the uplink and downlink, respectively.

It is to be understood that the embodiments described herein may beimplemented in hardware, software, firmware, middleware, microcode, orany combination thereof. For a hardware implementation, the processingunits may be implemented within one or more application specificintegrated circuits (ASICs), digital signal processors (DSPs), digitalsignal processing devices (DSPDs), programmable logic devices (PLDs),field programmable gate arrays (FPGAs), processors, controllers,micro-controllers, microprocessors, other electronic units designed toperform the functions described herein, or a combination thereof.

When the embodiments are implemented in software, firmware, middlewareor microcode, program code or code segments, they may be stored in amachine-readable medium, such as a storage component. A code segment mayrepresent a procedure, a function, a subprogram, a program, a routine, asubroutine, a module, a software package, a class, or any combination ofinstructions, data structures, or program statements. A code segment maybe coupled to another code segment or a hardware circuit by passingand/or receiving information, data, arguments, parameters, or memorycontents. Information, arguments, parameters, data, etc. may be passed,forwarded, or transmitted using any suitable means including memorysharing, message passing, token passing, network transmission, etc.

For a software implementation, the techniques described herein may beimplemented with modules (e.g., procedures, functions, and so on) thatperform the functions described herein. The software codes may be storedin memory units and executed by processors. The memory unit may beimplemented within the processor or external to the processor, in whichcase it can be communicatively coupled to the processor via variousmeans as is known in the art.

With reference to FIG. 10, illustrated is a system 1000 that facilitatesgenerates an interference indication to be broadcasted to a plurality ofmobile devices. For example, system 1000 may reside at least partiallywithin a base station. It is to be appreciated that system 1000 isrepresented as including functional blocks, which may be functionalblocks that represent functions implemented by a processor, software, orcombination thereof (e.g., firmware). System 1000 includes a logicalgrouping 1002 of electrical components that can act in conjunction. Forinstance, logical grouping 1002 may include an electrical component forproviding power control information in an assignment 1004. For example,minimum and maximum CoT values can be included in the assignment toenable setting a range for delta-based power control. While theseaforementioned parameters are assigned by base station 80, it is to beappreciated that the parameters need not be assigned through the samemechanisms or at the same time. For example, step sizes andminimum/maximum CoT values may be semi-static parameters that need notbe assigned for each packet or assignment. These parameters may beupdated through upper layer messages or the like whenever an update isneeded. Further, logical grouping 1002 may comprise an electricalcomponent for broadcasting an interference offset value 1006. Forexample, interference offset values can be broadcasted for every subbandand represent the IoT level observed for a subband. Moreover, logicalgrouping 1002 may include an electrical component for broadcasting othersector interference indications 1008. According to an example, othersector interference indications can include regular OSI indications thatenable slow delta value evaluations. Slow delta values may be employedas suggested values for mobile device assignments. In addition, OSIindications may include fast OSI indications that provide indications ofinterference for transmission on a subband. Fast OSI indication enableadjusting transmit delta values. Additionally, system 1000 may include amemory 1010 that retains instructions for executing functions associatedwith electrical components 1004, 1006, and 1008. While shown as beingexternal to memory 1010, it is to be understood that one or more ofelectrical components 1004, 1006, and 1008 may exist within memory 1010.

Turning to FIG. 11, illustrated is a system 1100 that adjusts power on areverse link. System 1100 may reside within a mobile device, forinstance. As depicted, system 1100 includes functional blocks that mayrepresent functions implemented by a processor, software, or combinationthereof (e.g., firmware). System 1100 includes a logical grouping 1102of electrical components that facilitate controlling forward linktransmission. Logical grouping 1102 may include an electrical componentfor establishing a delta value range 1104. For example, a slow deltavalue range or transmit delta value range can be set based uponconsiderations of power control information in an assignment and/orinterference offset values broadcasted by a serving base station.Moreover, logical grouping 1102 may include an electrical component forevaluating an adjustment to a delta value 1106. For example, slow deltavalues can be adjusted based upon considerations of broadcasted regularOSI indications. In addition, transmit delta value can be adjusted basedin part on fast OSI indications. Further, logical grouping 1102 maycomprise an electrical component for setting a power spectral density1108. For example, after evaluating an adjustment to a transmit deltavalue, the PSD of the reverse link traffic channel can be set based uponthe new delta value, among other things. Additionally, system 1100 mayinclude a memory 1110 that retains instructions for executing functionsassociated with electrical components 1104, 1106, and 1108. While shownas being external to memory 1110, it is to be understood that electricalcomponents 1104, 1106, and 1108 may exist within memory 1110.

What has been described above includes examples of one or moreembodiments. It is, of course, not possible to describe everyconceivable combination of components or methodologies for purposes ofdescribing the aforementioned embodiments, but one of ordinary skill inthe art may recognize that many further combinations and permutations ofvarious embodiments are possible. Accordingly, the described embodimentsare intended to embrace all such alterations, modifications andvariations that fall within the spirit and scope of the appended claims.Furthermore, to the extent that the term “includes” is used in eitherthe detailed description or the claims, such term is intended to beinclusive in a manner similar to the term “comprising” as “comprising”is interpreted when employed as a transitional word in a claim.

What is claimed is:
 1. A method that effectuates delta-based powercontrol, comprising: establishing an allowable range for a delta valuebased in part upon power control related information included in anassignment; evaluating an adjustment to the delta value based in part onbroadcasted other sector interference (OSI) indications; and setting apower spectral density corresponding to a reverse link traffic channelin accordance with the delta value.
 2. The method of claim 1, furthercomprising transmitting feedback to a serving base station.
 3. Themethod of claim 2, wherein the feedback comprises at least one of abuffer size, a quality of service (QoS) level, a maximum allowed power,power headroom or the delta value.
 4. The method of claim 1, wherein thepower control related information includes at least one of a minimumcarrier-over-thermal (CoT) value, a maximum CoT value, a targetcarrier-to-interference (C/I) value or a power adjustment step size. 5.The method of claim 1, wherein the delta value is a slow delta value andthe OSI indications are regular OSI indications.
 6. The method of claim5, further comprising maintaining and adjusting the slow delta valueevery superframe in accordance with the regular OSI indications.
 7. Themethod of claim 6, wherein maintaining and adjusting further comprisesgenerating an OSI monitor set that includes sectors that can beacquired.
 8. The method of claim 7, wherein generating the OSI monitorset comprises applying a threshold value to forward link geometries ofthe sectors.
 9. The method of claim 1, wherein the delta value is atransmit delta value and the OSI indications are fast OSI indications.10. The method of claim 9, wherein establishing a range the allowablerange is further based upon an interference offset value broadcasted bya serving base station.
 11. The method of claim 9, further comprisingmaintaining and adjusting the transmit delta value comprisesinitializing the transmit delta value to a maximum value for everyassignment.
 12. The method of claim 9, further comprising stepping upthe transmit delta value when all fast OSI indications specify nointerference.
 13. The method of claim 9, further comprising steppingdown the transmit delta value when any fast OSI indications specifyinterference.
 14. A wireless communications apparatus, comprising: amemory that retains instructions related to establishing an allowablerange for a delta value based in part upon power control relatedinformation included in an assignment, evaluating an adjustment to thedelta value based in part on broadcasted OSI indications and setting apower spectral density corresponding to a reverse link traffic channelin accordance with the delta value; an integrated circuit coupled to thememory, configured to execute the instructions retained in the memory.15. A wireless communications apparatus that effectuates delta-basedpower control, comprising: means for establishing an allowable range fora delta value based in part upon power control related informationincluded in an assignment; means for evaluating an adjustment to thedelta value based in part on broadcasted OSI indications; and means forsetting a power spectral density corresponding to a reverse link trafficchannel in accordance with the delta value.
 16. The wirelesscommunications apparatus of claim 15, further comprising means fortransmitting feedback to a serving base station.
 17. The wirelesscommunications apparatus of claim 16, wherein the feedback comprises atleast one of a buffer size, a quality of service (QoS) level, a maximumallowed power, power headroom or the delta value.
 18. The wirelesscommunications apparatus of claim 15, wherein the power control relatedinformation includes at least one of a minimum carrier-over-thermal(CoT) value, a maximum CoT value, a target carrier-to-interference (C/I)value or a power adjustment step size.
 19. The wireless communicationsapparatus of claim 15, wherein the delta value is a slow delta value andthe OSI indications are regular OSI indications.
 20. The wirelesscommunications apparatus of claim 19, further comprising means formaintaining and adjusting the slow delta value every superframe inaccordance with the regular OSI indications.
 21. The wirelesscommunications apparatus of claim 20, wherein means for maintaining andadjusting further comprises means for generating an OSI monitor set thatincludes sectors that can be acquired.
 22. The wireless communicationsapparatus of claim 21, further comprising generating a first OSI monitorset for regular OSI indications and a second OSI monitor set for fastOSI indications.
 23. The wireless communications apparatus of claim 22,wherein the second OSI monitor set is restricted to members of an activeset.
 24. The wireless communications apparatus of claim 21, whereinmeans for generating the OSI monitor set comprises applying a thresholdvalue to forward link geometries of the sectors.
 25. The wirelesscommunications apparatus of claim 21, wherein means for generating theOSI monitor set comprises applying a threshold value to chandiff valuesof the sectors.
 26. The wireless communications apparatus of claim 15,wherein the delta value is a transmit delta value and the OSIindications are fast OSI indications.
 27. The wireless communicationsapparatus of claim 26, wherein means for establishing a range theallowable range is further based upon an interference offset valuebroadcasted by a serving base station.
 28. The wireless communicationsapparatus of claim 26, further comprising means maintaining andadjusting the transmit delta value comprises initializing the transmitdelta value to a maximum value for every assignment.
 29. The wirelesscommunications apparatus of claim 26, further comprising means forstepping up the transmit delta value when all fast OSI indicationsspecify no interference.
 30. The wireless communications apparatus ofclaim 26, further comprising means for stepping down the transmit deltavalue when any fast OSI indications specify interference.
 31. Amachine-readable medium having stored thereon machine-executableinstructions for: establishing an allowable range for a delta valuebased in part upon power control related information included in anassignment; evaluating an adjustment to the delta value based in part onbroadcasted other sector interference (OSI) indications; and setting apower spectral density corresponding to a reverse link traffic channelin accordance with the delta value.
 32. The machine-readable medium ofclaim 31, further comprising instructions for transmitting feedback to aserving base station.
 33. The machine-readable medium of claim 31,wherein the feedback comprises at least one of a buffer size, a qualityof service (QoS) level, a maximum allowed power, power headroom or thedelta value.
 34. The machine-readable medium of claim 31, wherein thepower control related information includes at least one of a minimumcarrier-over-thermal (CoT) value, a maximum CoT value, a targetcarrier-to-interference (C/I) value or a power adjustment step size. 35.The machine-readable medium of claim 31, wherein the delta value is aslow delta value and the OSI indications are regular OSI indications.36. The machine-readable medium of claim 35, further comprisinginstructions for maintaining and adjusting the slow delta value everysuperframe in accordance with the regular OSI indications.
 37. Themachine-readable medium of claim 36, wherein maintaining and adjustingfurther comprises generating an OSI monitor set that includes sectorsthat can be acquired.
 38. The machine-readable medium of claim 37,further comprising generating a first OSI monitor set for regular OSIindications and a second OSI monitor set for fast OSI indications. 39.The machine-readable medium of claim 38, wherein the second OSI monitorset is restricted to members of an active set.
 40. The machine-readablemedium of claim 37,wherein generating the OSI monitor set comprisesapplying a threshold value to forward link geometries of the sectors.41. The machine-readable medium of claim 37, wherein generating the OSImonitor set comprises applying a threshold value to chandiff values ofthe sectors.
 42. The machine-readable medium of claim 31, wherein thedelta value is a transmit delta value and the OSI indications are fastOSI indications.
 43. The machine-readable medium of claim 42, whereinestablishing a range the allowable range is further based upon aninterference offset value broadcasted by a serving base station.
 44. Themachine-readable medium of claim 42, further comprising maintaining andadjusting the transmit delta value comprises initializing the transmitdelta value to a maximum value for every assignment.
 45. Themachine-readable medium of claim 42, further comprising stepping up thetransmit delta value when all fast OSI indications specify nointerference.
 46. The machine-readable medium of claim 42, furthercomprising stepping down the transmit delta value when any fast OSIindications specify interference.
 47. In a wireless communicationsystem, an apparatus comprising: an integrated circuit configured to:establish an allowable range for a delta value based in part upon powercontrol related information included in an assignment; determine anadjustment to the delta value based in part on broadcasted other sectorinterference (OSI) indications; and set a power spectral densitycorresponding to a reverse link traffic channel in accordance with thedelta value.